Improvement in grinding phosphate substances



UNITED OFFIc.

GEORGE T. LEYVIS, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN GRINDING. PHOSPHATE SUBSTANCES.

Specification forming part of Letters Patent N0. 11 Mi.,$93, datedMay 9, 1871.

To all whom it may concern:

Be it known that I, GEORGE T. LEWIS, of, the city and county of Philadelphia, in the State of Pennsylvania, have invented a new and useful Process for Grinding Phosphatic Snbstances,and especially mineral phosphates;

" and I do hereby declare the following to bee full, clear, and exact description thereof, which will enable others skilled in the" art to which it appertaius to practice m; vention.

lhosphatic substances-ha. J heretofore been ground in a dry state, but I have found that,

by grinding them with water the operation will be more perfectly and easilyefl'ected; and

the nature of my invention consists in grin'd in g these substances with water, as hereinafter described, so as to reduce them to a state of extremely fine division, in which condition they are easily dissolved, and are most fit to be used as fertilizers.

GEORGE T. LE WIS.

Witnesses J. M, GQLG-AN, D. M, Gnznur. 

